How we Get the Data Table Unique IDs Rows into another Data Table in c# for ASP.net for Grid View Binding:

  string[] FinalIDs = { };  
  DataTable dt1 = new DataTable();  
  DataTable dt2 = new DataTable();  
  FinalIDs = IDs.Distinct().ToArray();  
           int i = 0;  
       foreach (string Item in FinalIDs)  
       {  
         if (i == 0)  
         {  
           dt1.DefaultView.RowFilter = "Someid='" + Item + "'";  
           dt2 = (dt1.DefaultView).ToTable();  
         }  
         else  
         {  
           dt1.DefaultView.RowFilter = "Someid='" + Item + "'";  
           dt2.ImportRow((dt1.DefaultView).ToTable().Rows[0]);  
         }  
         i++;  
          }  
       i = 0;  

finally you can bind dt2 data table to any grid directly..

 gridView2.DataSource = dt2;  
 gridView2.DataBind();